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<?php /** * Static class to handle a slot-listening system. * * Unlike the slots/signals Qt model, this class manages something that is * more like a simple hashtable, where each slot has only one value. For that * reason "Registers" makes more sense, the reference being to CPU registers. * * This could be used for anything, but it's been built for a pretty specific phing * need, and that is to allow access to dynamic values that are set by logic * that is not represented in a build file. For exampe, we need a system for getting * the current resource (file) that is being processed by a filterchain in a fileset. * * Each slot corresponds to only one read-only, dynamic-value RegisterSlot object. In * a build.xml register slots are expressed using a syntax similar to variables: * * <replaceregexp> * <regexp pattern="\n" replace="%{task.current_file}"/> * </replaceregexp> * * The task/type must provide a supporting setter for the attribute: * * <code> * function setListeningReplace(RegisterSlot $slot) { * $this->replace = $slot; * } * * // in main() * if ($this->replace instanceof RegisterSlot) { * $this->regexp->setReplace($this->replace->getValue()); * } else { * $this->regexp->setReplace($this->replace); * } * </code> * * @author Hans Lellelid <hans@xmpl.org> * @version $Revision: 1.3 $ * @package phing.system.util */ class Register { /** Slots that have been registered */ private static $slots = array(); /** * Returns RegisterSlot for specified key. * * If not slot exists a new one is created for key. * * @param string $key * @return RegisterSlot */ public static function getSlot($key) { if (!isset(self::$slots[$key])) { self::$slots[$key] = new RegisterSlot($key); } return self::$slots[$key]; } } /** * Represents a slot in the register. */ class RegisterSlot { /** The name of this slot. */ private $key; /** The value for this slot. */ private $value; /** * Constructs a new RegisterSlot, setting the key to passed param. * @param string $key */ public function __construct($key) { $this->key = (string) $key; } /** * Sets the key / name for this slot. * @param string $k */ public function setKey($k) { $this->key = (string) $k; } /** * Gets the key / name for this slot. * @return string */ public function getKey() { return $this->key; } /** * Sets the value for this slot. * @param mixed */ public function setValue($v) { $this->value = $v; } /** * Returns the value at this slot. * @return mixed */ public function getValue() { return $this->value; } }
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